Piston construction



E. W. NAGEL ET AL Sept. 15. 1925.

PISTON CONSTRUCTION Filed may 4, 1925 IINVENTORS if. MNAGEL BY G, ZE'HNEfB:

ATTORNEYS Patented Sept. 15, 1925. t Y

UNITED STATES PATENT OFFICE.

EMILE WILLIAM' NAGEL AND may conrzany znmmn, or 'mtw W5,

LOUISIANA- PISTON CONSTRUCTION.

Application filed an 4,

To all whom it may concer'nk Be it known that we, EMILE W. NAGEL and HARRY G. ZEHNER, both citizens of the United States, and residentsof New Orleans, Orleans Parish, State of Louisiana, have invented a new and useful Improvement in Piston Constructions, of 'Which the following)is a full, clear," and exact description.

, ,ur invention relates to improvements in piston constructions, and it consists in the combinations, constructions, and arrangein' interrialcombustion engines of this type, f

where heretofore it has been necessary to remove the entire'piston by first disconnecting the piston fromthe crank shaft. ;This

latter operation necessitates the removal of -p0rti0ns of the crank case.

A further object of our. invention is to provide a piston construction of the, character described in which novel means is employed for maintaining the-two cooperat- -ing' arts of the'pisto'n against-movement relatlve-to one another during use in the engine; i

A further object of our invention is'to .provide a piston construction of thecharacter' described which is simple in construction, durable, and thoroughly practical for the purpose intended. I

Other objects and advantages will appear I in the following specification, and the novel features of the invention will be particularly (pointed out-in the appended" claim.

ur inventiorl is illustrated in the ac- ,companying drawings, forming part of this ap lication,.in whichigure 1- is a top plan view ment of our invention, 1 Figure 2 is a sectional view along the line 2-2 of Figure 1, and

I Figure 3 is a lan view of one of-the tools employed for disconnecting the cooperating parts of the piston. I In carrying out our invention we make of an embodi end of the member B which engages with the .in the 1925:. Serial m. 27,881.

use of a body member'A, in cross sectional contour similar to the lower portion of the standard piston. This member A has are duced .exteriorly threaded. portion 1 at the upper end thereof by means of which a ring bearing member B is secured, there'being an internallythreaded portion at the lovverv threaded part1 of the body member A. The outer walls 2 and 3 of'the body member A and member B respectively are cylindri Y cal and contiguous, so that when the parts A and are secured together they. have 'substantlally the same outward appearance as the standardpiston. Annular grooves 4,' are provided. in the member, B and piston rings 5' are disposed in the grooves. The

iston rings 5 are standard piston rin \Vith reference vto 'Figure' l it wil be noted that a pair ofaligned bosses 6 are provided on the inner :walls of the body, member through the bosses 6 by means of which a wrist pin 8, projected through the bores 7, v mayjserve as a support for the upper bearing pin being pro ected through the bearing.

portion.

The. body member A has a pairofv in ward-1y extending portions 11 having their u per surface 0 the reduced portion 1 These portions 11 each have bores 12 extending longitudinally of the body memberv A and comninnieating with the upper surface 13 of the body member. projected through threaded bores 15. in the j member B and adapted to engage'with and be received in the bores 12.;

' The bores 15 and 12 are inalign'ment with 06 "one another, when the member B has been the reduced. threaded portion 11 of the body member A. Thus,

turned tightly upon the bolts 14 serve 'to preventrotationof thev parts A and B relative hence separation ofthe parts. v The heads 16 of the bolts lare substantially hexagonal, and-are entirely received in cavities l7 provided-in the member B.

Means for preventing the looseningof the the member B is bolts 14 relative to rovidedina pair of lock washers 18 w ich have sharp depending incision points 19,

adapted to be-recelved in tiny bores provided 3 bottom wall of he cav ties thus no A. -'Coaxial bores 7 are provided contiguous with theiipper end Y A (pair of machine screws 1451s to one another, and: 100

vportion 9v of a connecting rod 10, the wrist? preventing the washers 18 from rotating relative to' the member B. I 7

Wing portions 20 of the washers 18 are providedwhich, when bent into en agement with the side walls of the threa s 16, as

shown in Figure 2,- effectually prevent rotation of the bolts relative to the member B.

.From the foregoing description of the various parts of the device the operation thereofmay be readily understood; .Let us assume that it is'desired to replace thepiston rings 5. Formerly this procedure necessitated the entire removal of the piston from the bore of the cylinder, which could not be accomplished until a part or all ofthe lower Section of the-crank case=of theengine was removed and the bearings of the connecting,

rods disconnected from the crankshaft. With our improved piston construction the mechanic removes the cylinder head and with a screw driver or the like he 'prys the win 20 out of engagement w'ith the'face oft e heads of the bolts -14'.-. 1He then redistances between the axes of the bores 15';

through a horizontal handle member havindg grips 26 at the go posite ends thereof..

on t e bolts '22 an 26, thus unscrewing themember B from the reduced threaded portion lot the body member manner the entire member 14 with an ordinary socket v 23 are securely en-' gaged with the memberB the handle mem-.' 'ber 25 is turned by means 'of the hand grips B may be lifted out of the cylinder bore and the rings 5 replaced.

The member B is then replaced in the bore of the cylinder and by means ofthe tool illustrated in Figure 3" it is screwed upon the reduced threaded portion 1 ofthe body member'A. The tool is then removed from en b0 ts l lfreplaced, as shown in Figure 2.

After the -bolts have been properly tightgag'ement with the member B, and the ened, the wings 20of the lock washers 18 a'removed into engagement with thetoutler' walls of the heads 16 of the bolts, and cylinder head may be replaced.

, We claim:

A piston of the character described ,com-

rising a tubular bodysmember forming the ower section of the piston, a Second mem- 'ber. .forming'the' up r section'ofsaid piston, said lower sectlon and said upper sec- I ti'on being provided with threads by means. of'which the two sections are screwed intoengagement with one another, said body member having inwardly extending" ortions on the inner- Sld8- walls thereof, wit tapering bores therein exten-din longitudinally of theibody member, and b0 ts having tapering portions at the outerends thereof, said bolts projected through threaded portions of the upper section-and arranged for projec'tion into and in engagement with the-side wallsof-the bores in'said inwardly extending iportions, whereby the sections may not be moved upon their threads when the bolts are d in place.

HARRY GODFREY ZEHN R. EMILE WILLIAM NAGEL. 

